3 The procedure
3.1 Inserting a corticosteroid‑eluting bioabsorbable stent or spacer for paranasal sinus disease aims to deliver topical corticosteroid after surgery and to maintain patency of the newly created drainage system. It is usually done with the patient under general anaesthesia, during functional endoscopic sinus surgery, which may include balloon sinuplasty. At the end of the surgery, the corticosteroid‑eluting stent is inserted into the relevant ostium under endoscopic guidance. The stent dissolves over a variable period of time.